Reply to post: Re: FPGAs

BBC bypasses Linux kernel to make streaming videos flow

Frumious Bandersnatch Silver badge

Re: FPGAs

Why don't they just use multicast or UDP?

Well the BBC is doing what they're doing because it gives them zero copy and ability to amortise kernel/userland context switches over lots of packets. Cloudflare is tinkering around in a similar way because it allows them to quickly write unprivileged software that will deal with new attack traffic.

UDP-based transmission is all well and good, but the problem these guys are trying to solve is a different one to the one you're thinking of (TCP's reliance on ACKs for flow control, with all that implies).

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